Description

Why should this be included in the repository? If we already offer similar software in our repository or third party, please provide information on what your proposed software does that our existing offerings don’t (differentiators).
First let's start with a brief description.

Media center allowing to watch movies, series, YouTube channels instantly.
You can watch in HD, with subtitles, and easily cast any file to TV through DLNA, Chromecast, AppleTV with one click!
Stremio also gives you notifications for new episodes / movies, as well as recommendations for content you might like.
Stremio's content is so rich because it has an Add-ons system, allowing different sources, such as YouTube, Filmon, Netflix, Amazon, Hulu, etc

Stremio is similar to Plex, Popcorn time, none of which are available in the repositories for now. Kodi is in the repositories, but it serves a slightly different function - media/DNLA server, while Stremio has many more sources: YouTube, Twitch,

Given we have no plans on flatpaking or snapping this application, closing as wontfix. I'd suggest reaching out to the respective developers about supporting either of those distribution and container models, or taking on the initiative.